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XMM-Newton Discovery of an X-Ray Filament in Coma

  • A. Finoguenov
  • U. G. Briel
  • J. P. Henry
Conference paper
Part of the Astrophysics and Space Science Library book series (ASSL, volume 309)

Abstract

XMM-Newton observations of the outskirts of the Coma cluster of galaxies confirm the existence of warm X-ray gas claimed previously and provide a robust estimate of its temperature (~ 0.2 keV) and oxygen abundance (~ 0.1 solar). Associating this emission with a 20 Mpc infall region in front of Coma, seen in the skewness of its galaxy velocity distribution, yields an estimate of the density of the warm gas of ~ 50 Pcritical . Our measurements of gas mass associated with the warm emission strongly support its nonvirialized nature, suggesting that we are observing the warm-hot intergalactic medium (WHIM). Our measurements provide a direct estimate of the O, Ne and Fe abundance of the WHIM. Differences with the reported Ne/O ratio for some OVI absorbers hints to different origin of the OVI absorbers and the Coma filament.

Keywords

clusters: individual: Coma cosmology: observations intergalactic medium large-scale structure 

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Copyright information

© Springer Science+Business Media Dordrecht 2004

Authors and Affiliations

  • A. Finoguenov
    • 1
  • U. G. Briel
    • 1
  • J. P. Henry
    • 2
  1. 1.Max-Planck-Institut fuer extraterrestrische PhysikGarchingGermany
  2. 2.Institute for AstronomyUniversity of HawaiiHonoluluUSA

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